• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

For symptom byte information, refer to Symptom Byte List

The rear differential clutch control module monitors the speed of the AWD oil pump motor by using a hall effect sensor which is internal to the differential clutch pump. The sensor is a transducer that varies its output voltage in response to a magnetic field.

• The engine is running.
• Battery voltage is between 9-16 V.
• The engine speed is above 400 rpm.

The AWD oil pump motor speed sensor supply circuit voltage is below 1.0 V.

The AWD oil pump motor speed sensor supply circuit voltage is above 6.0 V.

A plausibility error is detected on the AWD oil pump motor speed sensor signal circuit.

• Electronic limited slip is disabled for the duration of the key cycle.
• The AWD SERVICE message is displayed in the driver information center.

• The condition for the DTC is no longer present.
• The DTC is not detected in 40 consecutive ignition cycles.

Rear Axle Schematics

Master Electrical Component List

Rear Drive Axle Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M32 Differential Clutch Pump. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between the low reference circuit terminal 5 and ground.
• If 10 Ω or greater
1. Ignition OFF, disconnect the X2 harness connector at the K47 Rear Differential Clutch Control Module.
2. Test for less than 2 Ω in the low reference circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the K47 Rear Differential Clutch Control Module.
• If less than 10 Ω
3. Ignition ON/Vehicle in Service Mode.
4. Test for 4.8–5.2 V between the 5 V reference circuit terminal 1 and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the X2 harness connector at the K47 Rear Differential Clutch Control Module.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 Ω in the 5 V reference circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the K47 Rear Differential Clutch Control Module.
• If greater than 5.2 V
1. Ignition OFF, disconnect the X2 harness connector at the K47 Rear Differential Clutch Control Module, Ignition ON/Vehicle in Service Mode.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K47 Rear Differential Clutch Control Module.
• If between 4.8–5.2 V
5. Test for 4.4–4.8 V between the signal circuit terminals listed below and ground.
• Signal Circuit Terminal 2
• Signal Circuit Terminal 3
• Signal Circuit Terminal 4
• If less than 4.4 V
1. Ignition OFF, disconnect the X2 harness connector at the K47 Rear Differential Clutch Control Module.
2. Test for infinite resistance between the appropriate signal circuit terminal and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 Ω in the appropriate signal circuit terminal end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the K47 Rear Differential Clutch Control Module.
• If greater than 4.8 V
1. Ignition OFF, disconnect the X2 harness connector at the K47 Rear Differential Clutch Control Module, Ignition ON/Vehicle in Service Mode.
2. Test for less than 1 V between the appropriate signal circuit terminal and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K47 Rear Differential Clutch Control Module.
• If between 4.4–4.8 V
6. Test or replace the M32 Differential Clutch Pump.
7. Operate the vehicle under the conditions for setting the DTC, the DTC should not set.
• If the DTC sets

  Replace the K47 Rear Differential Clutch Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

• Differential Carrier Assembly Replacement for M32 Differential Clutch Pump.
• Control Module References for control module replacement, programming and setup.